Abstract
Elastodynamic models are developed for both contact ultrasonic compressional wave and shear wave transducers radiating into an elastic solid. Explicit high-frequency asymptotic solutions are obtained for the major wave components present in the transducer responses. These solutions are compared, in both the frequency and time domains, with the response of a piston transducer radiating into a fluid. It is demonstrated that, within the main beam of the transducer and in the farfield, the fluid model accurately predicts the response in the elastic solid for both the compressional and shear wave cases. In the nearfield, the elastodynamic models provide a more complete description of the transducer radiated wave field.
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